Lock nut and method of making the same



May 3, 1927. 1,627,297

w. E. SHARP LOCK NUT AND METHOD OF MAKING THE SAME Filed May 15, 1922Patented May 3, 1927.

UNITED-7 STATES PATENTYOYFFICE. v

WILLIAM SHARI, or CHICAGO, ILLINOIS, 'AssIeNon TO GBIPNU'I coMrAnY, or

y CHICAGO, ILLINOIS, A CORPORATION or LLInoIs.

LOCK NUT AND METHOD or MAKING THE SAME.

1 Application filial May 15,

My invention belongs to that general class of lock nuts in which aportion of the threads extending through the nut are, during the processof. manufacture, caused to take an abnormal position,.bent or otherwise, while the remainder of the threads are preferablynormal. By thisconstruction the nut may be readily threaded on'the cooperating boltuntil the threads 1n the bolt reach the abnormal threads, at which pointthe threads of the nut so engage the threads of the bolt as topractically lock the nut thereon in such manner that 1t may not beaccidentally disengaged by vibration or jarring. Such nuts areparticularly valuable in all places where they are mounted upon partswhich are particularly sub]ect to V1- bration, as upon railroad cars,locomotives, automobiles, and the like v The object of my presentinvention is to produce a nut of the general character de-.

scribed which shall be practical and effective in operation, economlcalin construction and durable in use. p I

To this end my invention consists in the novel construction, arrangementand combination of parts herein shown and described,

particularly pointed out in the Fig. 4. is a section taken substantiallyon line H of Fig. 1; and y Fig. 5 is a similar section taken on line 5-5of Fig. 1.. V

In the preferred form illustrated in the drawings, 1 indicates asuitable nut blank,

as shown, hexagon in form, although an other form may be employed ifpreferre In forming the blank, a centrally disposed ridge 2 is formed onone face of the nut,

while on the other face directly opposite and substantially parallelthereto. is formed a depression 3. The depression, as shown, is of awidth slightly greater than the width of the ridge. After the blank isso formed and the bolt hole punched therein, the nut is threaded in theusual manner. Thereafter the flat face 4; is placed upon an 'anvil sobolt than do the normal the bolt hole 1922 Serial no. 560,994.

to supported preferably clear across the same, except only in line withthe depression 1 3.} Pressure is thenbrought to bear; upon the ridge 2suiiicient to cause the metal sub-' stantially'in alignment with thesjoacebetweenfthe: outer edge of the ridge, as at-i5, and the inner edgeof the depressio'nyas at 6, to be slightly bent or distorted. It is forthis reason that the depression is slightly wider than the ridge, so ato cause the tend- I ency to bend to be somewhat greater than thetendency to cause the metal to flow should the face 4 oftlie nut be fullclear across in the usual manner.

The deflection necessarily is but slight and causes but aslightmodification of the distance between'the contiguous threads of 1the-nut,as otherwise the nut could not be threaded upon the bolt. Thedeflection, however, is sufficient to bring the threads in linetherewith to such position that they will bear or bind with greaterfrictional force upon the cooperating threads of the to clearly bringout unaffected threads In the drawings such deflection curedsatisfactory results with nuts for 1000- motive use 5% inchesfrom fiatedge to flat edge in a hexagon nut, with a bolt hole 3.317 in diameter,in which the ridge was 2 in width and the depression 2-63/64 of an inch.This is only illustrative, however,

showing the adaptability of this form of nut for heavy service onlocomotives. I have also secured satisfactory. results with of an inchdown, so that the nut is adapted for all purposes.

. Having thus described my invention, it is obvious that variousimmaterial modifications may be made in the same without departing fromthe-spirit of my invention; hence I donotwish to be understood'aslimiting myself to the exact form, construe tion,'arrangement andcombination of parts herein shown and described, or uses mentioned. y I

What I claim as new and d ire to secure Letters Fatent s; r

1. The process of manufacturing a lock nut, consisting in taking a nutblank pro vided With an elevated ridge on one face and a depression onthe other face, the width of the depression being slightly greater thanthe width of the ridge, screw-threading the blank, and placing the-nutwith its recessed face upon a suitable anvil and applying pressure tothe ridge to cause. the threads in alignment with the ridge anddepression to be slightly distorted out of their normal form. f

2. A lock nut comprising a ed :nut provided with an elevated ridge onone face and a cooperating depression on the other face, the depressionbeing of slightly greater width than the ridge, with the screw-threadface and a cooperating depresion 0n the other face, the bottom depressedportion below the ridge being angular, with the threads in alignmentwith the ridge and depression in the region of their junction with thebody slightly bent out of their normal position.

In testimony whereof, I have hereunto signed my name.

WILLIAM E. SHARP.

